Abstract High-strength and high-elastic copper alloy not only has super mechanical properties, but also has good corrosion resistance. Therefore, it is widely used in marine engineering. In this paper, three kinds of CuNiMnNbCrZr alloy with different Al contents are designed. And their mechanical properties and corrosion behavior in 3.5 wt% NaCl solution were studied. The Cu-20Ni-20Mn-0.3Nb-0.3Cr-0.3Zr alloy has good mechanical properties (Tensile strength: 1445 MPa, Yield strength: 1223 MPa, Elongation: 6.8%) and nice corrosion resistance (Corrosion rate: 0.0087 mm/a). By comparing the polarization resistance, self-corrosion potential, equivalent resistance and XPS analysis of three alloys, a further enhanced corrosion resistance is found in the alloy with Al element added. The results revealed that a dense Al2O3 film was formed during the corrosion process, which prevented the substrate from being corroded. These newly developed high-strength and high-elasticity copper alloys have great potential for marine environment applications.

中文翻译：

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添加Al对高强高弹Cu-20Ni-20Mn-0.3Nb-0.3Cr-0.3Zr合金腐蚀行为和力学性能的影响

摘要 高强高弹铜合金不仅具有超强的力学性能，而且具有良好的耐腐蚀性能。因此，它被广泛应用于海洋工程。本文设计了三种不同Al含量的CuNiMnNbCrZr合金。并研究了它们在3.5 wt% NaCl溶液中的力学性能和腐蚀行为。Cu-20Ni-20Mn-0.3Nb-0.3Cr-0.3Zr合金具有良好的机械性能（抗拉强度：1445 MPa，屈服强度：1223 MPa，延伸率：6.8%）和良好的耐腐蚀性（腐蚀速率：0.0087 mm/a） ）。通过比较三种合金的极化电阻、自腐蚀电位、等效电阻和XPS分析，发现添加Al元素的合金的耐腐蚀性能进一步提高。结果表明，在腐蚀过程中形成了致密的Al2O3薄膜，防止了基体被腐蚀。这些新开发的高强度高弹性铜合金在海洋环境应用方面具有巨大潜力。